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Stockholders' Equity (Schedule of Fair Value of Employee Stock Purchase Plan) (Details) - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Dividend yield 0.00%    
ESPP [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Risk-free interest rate, minimum 0.60% 0.10% 0.10%
Risk-free interest rate, maximum 3.51% 0.20% 1.00%
Weighted average grant date fair value, Granted $ 4.28 $ 25.07 $ 1.87
ESPP [Member] | Minimum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Expected term in years 6 months 6 months 6 months
Expected volatility 70.00% 67.00% 57.00%
ESPP [Member] | Maximum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Expected term in years 2 years 2 years 2 years
Expected volatility 97.00% 68.00% 71.00%